rerere.c

   1 #include "cache.h"
   2 #include "lockfile.h"
   3 #include "string-list.h"
   4 #include "rerere.h"
   5 #include "xdiff-interface.h"
   6 #include "dir.h"
   7 #include "resolve-undo.h"
   8 #include "ll-merge.h"
   9 #include "attr.h"
  10 #include "pathspec.h"
  11
  12 #define RESOLVED 0
  13 #define PUNTED 1
  14 #define THREE_STAGED 2
  15 void *RERERE_RESOLVED = &RERERE_RESOLVED;
  16
  17 /* if rerere_enabled == -1, fall back to detection of .git/rr-cache */
  18 static int rerere_enabled = -1;
  19
  20 /* automatically update cleanly resolved paths to the index */
  21 static int rerere_autoupdate;
  22
  23 const char *rerere_path(const char *hex, const char *file)
  24 {
  25         return git_path("rr-cache/%s/%s", hex, file);
  26 }
  27
  28 static int has_rerere_resolution(const char *hex)
  29 {
  30         struct stat st;
  31         return !stat(rerere_path(hex, "postimage"), &st);
  32 }
  33
  34 static void read_rr(struct string_list *rr)
  35 {
  36         unsigned char sha1[20];
  37         char buf[PATH_MAX];
  38         FILE *in = fopen(git_path_merge_rr(), "r");
  39         if (!in)
  40                 return;
  41         while (fread(buf, 40, 1, in) == 1) {
  42                 int i;
  43                 char *name;
  44                 if (get_sha1_hex(buf, sha1))
  45                         die("corrupt MERGE_RR");
  46                 buf[40] = '\0';
  47                 name = xstrdup(buf);
  48                 if (fgetc(in) != '\t')
  49                         die("corrupt MERGE_RR");
  50                 for (i = 0; i < sizeof(buf); i++) {
  51                         int c = fgetc(in);
  52                         if (c < 0)
  53                                 die("corrupt MERGE_RR");
  54                         buf[i] = c;
  55                         if (c == 0)
  56                                  break;
  57                 }
  58                 if (i == sizeof(buf))
  59                         die("filename too long");
  60                 string_list_insert(rr, buf)->util = name;
  61         }
  62         fclose(in);
  63 }
  64
  65 static struct lock_file write_lock;
  66
  67 static int write_rr(struct string_list *rr, int out_fd)
  68 {
  69         int i;
  70         for (i = 0; i < rr->nr; i++) {
  71                 const char *path;
  72                 int length;
  73                 if (!rr->items[i].util)
  74                         continue;
  75                 path = rr->items[i].string;
  76                 length = strlen(path) + 1;
  77                 if (write_in_full(out_fd, rr->items[i].util, 40) != 40 ||
  78                     write_str_in_full(out_fd, "\t") != 1 ||
  79                     write_in_full(out_fd, path, length) != length)
  80                         die("unable to write rerere record");
  81         }
  82         if (commit_lock_file(&write_lock) != 0)
  83                 die("unable to write rerere record");
  84         return 0;
  85 }
  86
  87 static void ferr_write(const void *p, size_t count, FILE *fp, int *err)
  88 {
  89         if (!count || *err)
  90                 return;
  91         if (fwrite(p, count, 1, fp) != 1)
  92                 *err = errno;
  93 }
  94
  95 static inline void ferr_puts(const char *s, FILE *fp, int *err)
  96 {
  97         ferr_write(s, strlen(s), fp, err);
  98 }
  99
 100 struct rerere_io {
 101         int (*getline)(struct strbuf *, struct rerere_io *);
 102         FILE *output;
 103         int wrerror;
 104         /* some more stuff */
 105 };
 106
 107 static void rerere_io_putstr(const char *str, struct rerere_io *io)
 108 {
 109         if (io->output)
 110                 ferr_puts(str, io->output, &io->wrerror);
 111 }
 112
 113 static void rerere_io_putconflict(int ch, int size, struct rerere_io *io)
 114 {
 115         char buf[64];
 116
 117         while (size) {
 118                 if (size < sizeof(buf) - 2) {
 119                         memset(buf, ch, size);
 120                         buf[size] = '\n';
 121                         buf[size + 1] = '\0';
 122                         size = 0;
 123                 } else {
 124                         int sz = sizeof(buf) - 1;
 125                         if (size <= sz)
 126                                 sz -= (sz - size) + 1;
 127                         memset(buf, ch, sz);
 128                         buf[sz] = '\0';
 129                         size -= sz;
 130                 }
 131                 rerere_io_putstr(buf, io);
 132         }
 133 }
 134
 135 static void rerere_io_putmem(const char *mem, size_t sz, struct rerere_io *io)
 136 {
 137         if (io->output)
 138                 ferr_write(mem, sz, io->output, &io->wrerror);
 139 }
 140
 141 struct rerere_io_file {
 142         struct rerere_io io;
 143         FILE *input;
 144 };
 145
 146 static int rerere_file_getline(struct strbuf *sb, struct rerere_io *io_)
 147 {
 148         struct rerere_io_file *io = (struct rerere_io_file *)io_;
 149         return strbuf_getwholeline(sb, io->input, '\n');
 150 }
 151
 152 static int is_cmarker(char *buf, int marker_char, int marker_size, int want_sp)
 153 {
 154         while (marker_size--)
 155                 if (*buf++ != marker_char)
 156                         return 0;
 157         if (want_sp && *buf != ' ')
 158                 return 0;
 159         return isspace(*buf);
 160 }
 161
 162 static int handle_path(unsigned char *sha1, struct rerere_io *io, int marker_size)
 163 {
 164         git_SHA_CTX ctx;
 165         int hunk_no = 0;
 166         enum {
 167                 RR_CONTEXT = 0, RR_SIDE_1, RR_SIDE_2, RR_ORIGINAL
 168         } hunk = RR_CONTEXT;
 169         struct strbuf one = STRBUF_INIT, two = STRBUF_INIT;
 170         struct strbuf buf = STRBUF_INIT;
 171
 172         if (sha1)
 173                 git_SHA1_Init(&ctx);
 174
 175         while (!io->getline(&buf, io)) {
 176                 if (is_cmarker(buf.buf, '<', marker_size, 1)) {
 177                         if (hunk != RR_CONTEXT)
 178                                 goto bad;
 179                         hunk = RR_SIDE_1;
 180                 } else if (is_cmarker(buf.buf, '|', marker_size, 0)) {
 181                         if (hunk != RR_SIDE_1)
 182                                 goto bad;
 183                         hunk = RR_ORIGINAL;
 184                 } else if (is_cmarker(buf.buf, '=', marker_size, 0)) {
 185                         if (hunk != RR_SIDE_1 && hunk != RR_ORIGINAL)
 186                                 goto bad;
 187                         hunk = RR_SIDE_2;
 188                 } else if (is_cmarker(buf.buf, '>', marker_size, 1)) {
 189                         if (hunk != RR_SIDE_2)
 190                                 goto bad;
 191                         if (strbuf_cmp(&one, &two) > 0)
 192                                 strbuf_swap(&one, &two);
 193                         hunk_no++;
 194                         hunk = RR_CONTEXT;
 195                         rerere_io_putconflict('<', marker_size, io);
 196                         rerere_io_putmem(one.buf, one.len, io);
 197                         rerere_io_putconflict('=', marker_size, io);
 198                         rerere_io_putmem(two.buf, two.len, io);
 199                         rerere_io_putconflict('>', marker_size, io);
 200                         if (sha1) {
 201                                 git_SHA1_Update(&ctx, one.buf ? one.buf : "",
 202                                             one.len + 1);
 203                                 git_SHA1_Update(&ctx, two.buf ? two.buf : "",
 204                                             two.len + 1);
 205                         }
 206                         strbuf_reset(&one);
 207                         strbuf_reset(&two);
 208                 } else if (hunk == RR_SIDE_1)
 209                         strbuf_addbuf(&one, &buf);
 210                 else if (hunk == RR_ORIGINAL)
 211                         ; /* discard */
 212                 else if (hunk == RR_SIDE_2)
 213                         strbuf_addbuf(&two, &buf);
 214                 else
 215                         rerere_io_putstr(buf.buf, io);
 216                 continue;
 217         bad:
 218                 hunk = 99; /* force error exit */
 219                 break;
 220         }
 221         strbuf_release(&one);
 222         strbuf_release(&two);
 223         strbuf_release(&buf);
 224
 225         if (sha1)
 226                 git_SHA1_Final(sha1, &ctx);
 227         if (hunk != RR_CONTEXT)
 228                 return -1;
 229         return hunk_no;
 230 }
 231
 232 static int handle_file(const char *path, unsigned char *sha1, const char *output)
 233 {
 234         int hunk_no = 0;
 235         struct rerere_io_file io;
 236         int marker_size = ll_merge_marker_size(path);
 237
 238         memset(&io, 0, sizeof(io));
 239         io.io.getline = rerere_file_getline;
 240         io.input = fopen(path, "r");
 241         io.io.wrerror = 0;
 242         if (!io.input)
 243                 return error("Could not open %s", path);
 244
 245         if (output) {
 246                 io.io.output = fopen(output, "w");
 247                 if (!io.io.output) {
 248                         fclose(io.input);
 249                         return error("Could not write %s", output);
 250                 }
 251         }
 252
 253         hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
 254
 255         fclose(io.input);
 256         if (io.io.wrerror)
 257                 error("There were errors while writing %s (%s)",
 258                       path, strerror(io.io.wrerror));
 259         if (io.io.output && fclose(io.io.output))
 260                 io.io.wrerror = error("Failed to flush %s: %s",
 261                                       path, strerror(errno));
 262
 263         if (hunk_no < 0) {
 264                 if (output)
 265                         unlink_or_warn(output);
 266                 return error("Could not parse conflict hunks in %s", path);
 267         }
 268         if (io.io.wrerror)
 269                 return -1;
 270         return hunk_no;
 271 }
 272
 273 struct rerere_io_mem {
 274         struct rerere_io io;
 275         struct strbuf input;
 276 };
 277
 278 static int rerere_mem_getline(struct strbuf *sb, struct rerere_io *io_)
 279 {
 280         struct rerere_io_mem *io = (struct rerere_io_mem *)io_;
 281         char *ep;
 282         size_t len;
 283
 284         strbuf_release(sb);
 285         if (!io->input.len)
 286                 return -1;
 287         ep = memchr(io->input.buf, '\n', io->input.len);
 288         if (!ep)
 289                 ep = io->input.buf + io->input.len;
 290         else if (*ep == '\n')
 291                 ep++;
 292         len = ep - io->input.buf;
 293         strbuf_add(sb, io->input.buf, len);
 294         strbuf_remove(&io->input, 0, len);
 295         return 0;
 296 }
 297
 298 static int handle_cache(const char *path, unsigned char *sha1, const char *output)
 299 {
 300         mmfile_t mmfile[3] = {{NULL}};
 301         mmbuffer_t result = {NULL, 0};
 302         const struct cache_entry *ce;
 303         int pos, len, i, hunk_no;
 304         struct rerere_io_mem io;
 305         int marker_size = ll_merge_marker_size(path);
 306
 307         /*
 308          * Reproduce the conflicted merge in-core
 309          */
 310         len = strlen(path);
 311         pos = cache_name_pos(path, len);
 312         if (0 <= pos)
 313                 return -1;
 314         pos = -pos - 1;
 315
 316         for (i = 0; i < 3; i++) {
 317                 enum object_type type;
 318                 unsigned long size;
 319                 int j;
 320
 321                 if (active_nr <= pos)
 322                         break;
 323                 ce = active_cache[pos++];
 324                 if (ce_namelen(ce) != len || memcmp(ce->name, path, len))
 325                         continue;
 326                 j = ce_stage(ce) - 1;
 327                 mmfile[j].ptr = read_sha1_file(ce->sha1, &type, &size);
 328                 mmfile[j].size = size;
 329         }
 330         for (i = 0; i < 3; i++) {
 331                 if (!mmfile[i].ptr && !mmfile[i].size)
 332                         mmfile[i].ptr = xstrdup("");
 333         }
 334         /*
 335          * NEEDSWORK: handle conflicts from merges with
 336          * merge.renormalize set, too
 337          */
 338         ll_merge(&result, path, &mmfile[0], NULL,
 339                  &mmfile[1], "ours",
 340                  &mmfile[2], "theirs", NULL);
 341         for (i = 0; i < 3; i++)
 342                 free(mmfile[i].ptr);
 343
 344         memset(&io, 0, sizeof(io));
 345         io.io.getline = rerere_mem_getline;
 346         if (output)
 347                 io.io.output = fopen(output, "w");
 348         else
 349                 io.io.output = NULL;
 350         strbuf_init(&io.input, 0);
 351         strbuf_attach(&io.input, result.ptr, result.size, result.size);
 352
 353         hunk_no = handle_path(sha1, (struct rerere_io *)&io, marker_size);
 354         strbuf_release(&io.input);
 355         if (io.io.output)
 356                 fclose(io.io.output);
 357         return hunk_no;
 358 }
 359
 360 static int check_one_conflict(int i, int *type)
 361 {
 362         const struct cache_entry *e = active_cache[i];
 363
 364         if (!ce_stage(e)) {
 365                 *type = RESOLVED;
 366                 return i + 1;
 367         }
 368
 369         *type = PUNTED;
 370         if (ce_stage(e) == 1) {
 371                 if (active_nr <= ++i)
 372                         return i + 1;
 373         }
 374
 375         /* Only handle regular files with both stages #2 and #3 */
 376         if (i + 1 < active_nr) {
 377                 const struct cache_entry *e2 = active_cache[i];
 378                 const struct cache_entry *e3 = active_cache[i + 1];
 379                 if (ce_stage(e2) == 2 &&
 380                     ce_stage(e3) == 3 &&
 381                     ce_same_name(e, e3) &&
 382                     S_ISREG(e2->ce_mode) &&
 383                     S_ISREG(e3->ce_mode))
 384                         *type = THREE_STAGED;
 385         }
 386
 387         /* Skip the entries with the same name */
 388         while (i < active_nr && ce_same_name(e, active_cache[i]))
 389                 i++;
 390         return i;
 391 }
 392
 393 static int find_conflict(struct string_list *conflict)
 394 {
 395         int i;
 396         if (read_cache() < 0)
 397                 return error("Could not read index");
 398
 399         for (i = 0; i < active_nr;) {
 400                 int conflict_type;
 401                 const struct cache_entry *e = active_cache[i];
 402                 i = check_one_conflict(i, &conflict_type);
 403                 if (conflict_type == THREE_STAGED)
 404                         string_list_insert(conflict, (const char *)e->name);
 405         }
 406         return 0;
 407 }
 408
 409 int rerere_remaining(struct string_list *merge_rr)
 410 {
 411         int i;
 412         if (setup_rerere(merge_rr, RERERE_READONLY))
 413                 return 0;
 414         if (read_cache() < 0)
 415                 return error("Could not read index");
 416
 417         for (i = 0; i < active_nr;) {
 418                 int conflict_type;
 419                 const struct cache_entry *e = active_cache[i];
 420                 i = check_one_conflict(i, &conflict_type);
 421                 if (conflict_type == PUNTED)
 422                         string_list_insert(merge_rr, (const char *)e->name);
 423                 else if (conflict_type == RESOLVED) {
 424                         struct string_list_item *it;
 425                         it = string_list_lookup(merge_rr, (const char *)e->name);
 426                         if (it != NULL) {
 427                                 free(it->util);
 428                                 it->util = RERERE_RESOLVED;
 429                         }
 430                 }
 431         }
 432         return 0;
 433 }
 434
 435 static int merge(const char *name, const char *path)
 436 {
 437         int ret;
 438         mmfile_t cur = {NULL, 0}, base = {NULL, 0}, other = {NULL, 0};
 439         mmbuffer_t result = {NULL, 0};
 440
 441         if (handle_file(path, NULL, rerere_path(name, "thisimage")) < 0)
 442                 return 1;
 443
 444         if (read_mmfile(&cur, rerere_path(name, "thisimage")) ||
 445                         read_mmfile(&base, rerere_path(name, "preimage")) ||
 446                         read_mmfile(&other, rerere_path(name, "postimage"))) {
 447                 ret = 1;
 448                 goto out;
 449         }
 450         ret = ll_merge(&result, path, &base, NULL, &cur, "", &other, "", NULL);
 451         if (!ret) {
 452                 FILE *f;
 453
 454                 if (utime(rerere_path(name, "postimage"), NULL) < 0)
 455                         warning("failed utime() on %s: %s",
 456                                         rerere_path(name, "postimage"),
 457                                         strerror(errno));
 458                 f = fopen(path, "w");
 459                 if (!f)
 460                         return error("Could not open %s: %s", path,
 461                                      strerror(errno));
 462                 if (fwrite(result.ptr, result.size, 1, f) != 1)
 463                         error("Could not write %s: %s", path, strerror(errno));
 464                 if (fclose(f))
 465                         return error("Writing %s failed: %s", path,
 466                                      strerror(errno));
 467         }
 468
 469 out:
 470         free(cur.ptr);
 471         free(base.ptr);
 472         free(other.ptr);
 473         free(result.ptr);
 474
 475         return ret;
 476 }
 477
 478 static struct lock_file index_lock;
 479
 480 static void update_paths(struct string_list *update)
 481 {
 482         int i;
 483
 484         hold_locked_index(&index_lock, 1);
 485
 486         for (i = 0; i < update->nr; i++) {
 487                 struct string_list_item *item = &update->items[i];
 488                 if (add_file_to_cache(item->string, 0))
 489                         exit(128);
 490         }
 491
 492         if (active_cache_changed) {
 493                 if (write_locked_index(&the_index, &index_lock, COMMIT_LOCK))
 494                         die("Unable to write new index file");
 495         } else
 496                 rollback_lock_file(&index_lock);
 497 }
 498
 499 static int do_plain_rerere(struct string_list *rr, int fd)
 500 {
 501         struct string_list conflict = STRING_LIST_INIT_DUP;
 502         struct string_list update = STRING_LIST_INIT_DUP;
 503         int i;
 504
 505         find_conflict(&conflict);
 506
 507         /*
 508          * MERGE_RR records paths with conflicts immediately after merge
 509          * failed.  Some of the conflicted paths might have been hand resolved
 510          * in the working tree since then, but the initial run would catch all
 511          * and register their preimages.
 512          */
 513
 514         for (i = 0; i < conflict.nr; i++) {
 515                 const char *path = conflict.items[i].string;
 516                 if (!string_list_has_string(rr, path)) {
 517                         unsigned char sha1[20];
 518                         char *hex;
 519                         int ret;
 520                         ret = handle_file(path, sha1, NULL);
 521                         if (ret < 1)
 522                                 continue;
 523                         hex = xstrdup(sha1_to_hex(sha1));
 524                         string_list_insert(rr, path)->util = hex;
 525                         if (mkdir_in_gitdir(git_path("rr-cache/%s", hex)))
 526                                 continue;
 527                         handle_file(path, NULL, rerere_path(hex, "preimage"));
 528                         fprintf(stderr, "Recorded preimage for '%s'\n", path);
 529                 }
 530         }
 531
 532         /*
 533          * Now some of the paths that had conflicts earlier might have been
 534          * hand resolved.  Others may be similar to a conflict already that
 535          * was resolved before.
 536          */
 537
 538         for (i = 0; i < rr->nr; i++) {
 539                 int ret;
 540                 const char *path = rr->items[i].string;
 541                 const char *name = (const char *)rr->items[i].util;
 542
 543                 if (has_rerere_resolution(name)) {
 544                         if (!merge(name, path)) {
 545                                 const char *msg;
 546                                 if (rerere_autoupdate) {
 547                                         string_list_insert(&update, path);
 548                                         msg = "Staged '%s' using previous resolution.\n";
 549                                 } else
 550                                         msg = "Resolved '%s' using previous resolution.\n";
 551                                 fprintf(stderr, msg, path);
 552                                 goto mark_resolved;
 553                         }
 554                 }
 555
 556                 /* Let's see if we have resolved it. */
 557                 ret = handle_file(path, NULL, NULL);
 558                 if (ret)
 559                         continue;
 560
 561                 fprintf(stderr, "Recorded resolution for '%s'.\n", path);
 562                 copy_file(rerere_path(name, "postimage"), path, 0666);
 563         mark_resolved:
 564                 rr->items[i].util = NULL;
 565         }
 566
 567         if (update.nr)
 568                 update_paths(&update);
 569
 570         return write_rr(rr, fd);
 571 }
 572
 573 static void git_rerere_config(void)
 574 {
 575         git_config_get_bool("rerere.enabled", &rerere_enabled);
 576         git_config_get_bool("rerere.autoupdate", &rerere_autoupdate);
 577         git_config(git_default_config, NULL);
 578 }
 579
 580 static GIT_PATH_FUNC(git_path_rr_cache, "rr-cache")
 581
 582 static int is_rerere_enabled(void)
 583 {
 584         int rr_cache_exists;
 585
 586         if (!rerere_enabled)
 587                 return 0;
 588
 589         rr_cache_exists = is_directory(git_path_rr_cache());
 590         if (rerere_enabled < 0)
 591                 return rr_cache_exists;
 592
 593         if (!rr_cache_exists && mkdir_in_gitdir(git_path_rr_cache()))
 594                 die("Could not create directory %s", git_path_rr_cache());
 595         return 1;
 596 }
 597
 598 int setup_rerere(struct string_list *merge_rr, int flags)
 599 {
 600         int fd;
 601
 602         git_rerere_config();
 603         if (!is_rerere_enabled())
 604                 return -1;
 605
 606         if (flags & (RERERE_AUTOUPDATE|RERERE_NOAUTOUPDATE))
 607                 rerere_autoupdate = !!(flags & RERERE_AUTOUPDATE);
 608         if (flags & RERERE_READONLY)
 609                 fd = 0;
 610         else
 611                 fd = hold_lock_file_for_update(&write_lock, git_path_merge_rr(),
 612                                                LOCK_DIE_ON_ERROR);
 613         read_rr(merge_rr);
 614         return fd;
 615 }
 616
 617 int rerere(int flags)
 618 {
 619         struct string_list merge_rr = STRING_LIST_INIT_DUP;
 620         int fd;
 621
 622         fd = setup_rerere(&merge_rr, flags);
 623         if (fd < 0)
 624                 return 0;
 625         return do_plain_rerere(&merge_rr, fd);
 626 }
 627
 628 static int rerere_forget_one_path(const char *path, struct string_list *rr)
 629 {
 630         const char *filename;
 631         char *hex;
 632         unsigned char sha1[20];
 633         int ret;
 634
 635         ret = handle_cache(path, sha1, NULL);
 636         if (ret < 1)
 637                 return error("Could not parse conflict hunks in '%s'", path);
 638         hex = xstrdup(sha1_to_hex(sha1));
 639         filename = rerere_path(hex, "postimage");
 640         if (unlink(filename))
 641                 return (errno == ENOENT
 642                         ? error("no remembered resolution for %s", path)
 643                         : error("cannot unlink %s: %s", filename, strerror(errno)));
 644
 645         handle_cache(path, sha1, rerere_path(hex, "preimage"));
 646         fprintf(stderr, "Updated preimage for '%s'\n", path);
 647
 648
 649         string_list_insert(rr, path)->util = hex;
 650         fprintf(stderr, "Forgot resolution for %s\n", path);
 651         return 0;
 652 }
 653
 654 int rerere_forget(struct pathspec *pathspec)
 655 {
 656         int i, fd;
 657         struct string_list conflict = STRING_LIST_INIT_DUP;
 658         struct string_list merge_rr = STRING_LIST_INIT_DUP;
 659
 660         if (read_cache() < 0)
 661                 return error("Could not read index");
 662
 663         fd = setup_rerere(&merge_rr, RERERE_NOAUTOUPDATE);
 664         if (fd < 0)
 665                 return 0;
 666
 667         unmerge_cache(pathspec);
 668         find_conflict(&conflict);
 669         for (i = 0; i < conflict.nr; i++) {
 670                 struct string_list_item *it = &conflict.items[i];
 671                 if (!match_pathspec(pathspec, it->string,
 672                                     strlen(it->string), 0, NULL, 0))
 673                         continue;
 674                 rerere_forget_one_path(it->string, &merge_rr);
 675         }
 676         return write_rr(&merge_rr, fd);
 677 }
 678
 679 static time_t rerere_created_at(const char *name)
 680 {
 681         struct stat st;
 682         return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
 683 }
 684
 685 static time_t rerere_last_used_at(const char *name)
 686 {
 687         struct stat st;
 688         return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime;
 689 }
 690
 691 static void unlink_rr_item(const char *name)
 692 {
 693         unlink(rerere_path(name, "thisimage"));
 694         unlink(rerere_path(name, "preimage"));
 695         unlink(rerere_path(name, "postimage"));
 696         rmdir(git_path("rr-cache/%s", name));
 697 }
 698
 699 void rerere_gc(struct string_list *rr)
 700 {
 701         struct string_list to_remove = STRING_LIST_INIT_DUP;
 702         DIR *dir;
 703         struct dirent *e;
 704         int i, cutoff;
 705         time_t now = time(NULL), then;
 706         int cutoff_noresolve = 15;
 707         int cutoff_resolve = 60;
 708
 709         if (setup_rerere(rr, 0) < 0)
 710                 return;
 711
 712         git_config_get_int("gc.rerereresolved", &cutoff_resolve);
 713         git_config_get_int("gc.rerereunresolved", &cutoff_noresolve);
 714         git_config(git_default_config, NULL);
 715         dir = opendir(git_path("rr-cache"));
 716         if (!dir)
 717                 die_errno("unable to open rr-cache directory");
 718         while ((e = readdir(dir))) {
 719                 if (is_dot_or_dotdot(e->d_name))
 720                         continue;
 721
 722                 then = rerere_last_used_at(e->d_name);
 723                 if (then) {
 724                         cutoff = cutoff_resolve;
 725                 } else {
 726                         then = rerere_created_at(e->d_name);
 727                         if (!then)
 728                                 continue;
 729                         cutoff = cutoff_noresolve;
 730                 }
 731                 if (then < now - cutoff * 86400)
 732                         string_list_append(&to_remove, e->d_name);
 733         }
 734         closedir(dir);
 735         for (i = 0; i < to_remove.nr; i++)
 736                 unlink_rr_item(to_remove.items[i].string);
 737         string_list_clear(&to_remove, 0);
 738         rollback_lock_file(&write_lock);
 739 }
 740
 741 void rerere_clear(struct string_list *merge_rr)
 742 {
 743         int i;
 744
 745         if (setup_rerere(merge_rr, 0) < 0)
 746                 return;
 747
 748         for (i = 0; i < merge_rr->nr; i++) {
 749                 const char *name = (const char *)merge_rr->items[i].util;
 750                 if (!has_rerere_resolution(name))
 751                         unlink_rr_item(name);
 752         }
 753         unlink_or_warn(git_path_merge_rr());
 754         rollback_lock_file(&write_lock);
 755 }